From a bug report received via email:

I made the following test (in synceval, I'm planning to make the same with EDS)
using the vCards Attached (jp.vCards.tgz);
Basically these are the 3 names used  in the vCard:
 -   1月
 -   111
 -   Bad
I used as reference this:
http://demo.icu-project.org/icu-bin/locexp?d_=en&x=col&_=ja

In the txt files there is the dbus-monitor dump of the 3 search tests I made:

 - Search.All.txt
 Here I used "[]" as filter and I got correctly all the 3 vCards

 - Search.1.txt
 Here I used "[ 'any-contains' , '1' ]" as filter and I retrieved correctly the
first two vCards ( "1月" and "111" ) 

 - Search.1月.txt
 Here I used "[ 'any-contains' , '1月' ]" as filter and I retrieved the first
two vCards ( "1月" and "111" )
 I expected to see only the first one.

- Search.月.txt
 Here I used "[ 'any-contains' , '月' ]" as filter and I retrieved all the
vCards

It seems that the non pure ASCII  characters are not evaluated in the search
options.